Bonjour vous pouvez m’aider svp.
30 The end of the track
A bobsled with a mass of 500 kg has finished the run mov-
ing at a speed of 40 m s-1. Brakes are now applied to slow
down. The sled comes to rest having travelled 200 m of a
horizontal part of the track.
12
DKB
BB
HALEY
HAUS
1. Calculate the work done in stopping the bobsled.
2. Assuming that brakes give a
constant retarding
force,
calculate the magnitude
of this force.